Nothing predicts future behavior as much as past impunity.

The great unknown in this country is where this leaves the Republican Party after this election. Will it be the party of the Kochs or will it be the party of [Donald] Trump?

David and Charles Koch are pretty much as far right as you can get on the ideological spectrum without falling off. They are far right libertarians, very anti-government, very pro-business, very anti-tax, anti-regulatory, in favour of free markets ruling the day.

Ethically, I think pretty much every code of ethics for doctors suggests that they should not be in an interrogation room, particularly if there's anything coercive or abusive going on.

There's been a 40-year effort on the far right to build up think tanks, academic programs, advocacy groups, to push a particular ideology. That's really where the impact is that people don't see.

And to me, it was interesting, some of the people I had interviewed who knew the insides to this program said that they also, to create anxiety and upset in the soldiers, they take Bibles and they trash them.

But there have been many news reports that water-boarding has been used on Khalid Sheikh Mohammed, who is one of the major al Qaeda figures that we have in U.S. custody.